//Md5.cpp
/* 
* RFC 1321 compliant MD5 implementation, 
* by Christophe Devine <devine@cr0.net>; 
* this program is licensed under the GPL. 
*/ 
#include "CMD5.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

namespace NCommon
{

#define uint8 unsigned char
#define uint32 unsigned int


#define GET_UINT32(n,b,i)\
{\
(n) = (uint32) ((uint8 *) b)[(i)]\
| (((uint32) ((uint8 *) b)[(i)+1]) << 8)\
| (((uint32) ((uint8 *) b)[(i)+2]) << 16)\
| (((uint32) ((uint8 *) b)[(i)+3]) << 24);\
}

#define PUT_UINT32(n,b,i)\
{\
(((uint8 *) b)[(i)] ) = (uint8) (((n)      ) & 0xFF);\
(((uint8 *) b)[(i)+1]) = (uint8) (((n) >> 8) & 0xFF);\
(((uint8 *) b)[(i)+2]) = (uint8) (((n) >> 16) & 0xFF);\
(((uint8 *) b)[(i)+3]) = (uint8) (((n) >> 24) & 0xFF);\
}
//extern pthread_mutex_t mutexMemory;

void CMD5::md5_starts( struct md5_context *ctx )
{
    ctx->total[0] = 0;
    ctx->total[1] = 0;
    ctx->state[0] = 0x67452301;
    ctx->state[1] = 0xEFCDAB89;
    ctx->state[2] = 0x98BADCFE;
    ctx->state[3] = 0x10325476;
}

void CMD5::md5_process( struct md5_context *ctx, const uint8 data[64] )
{
    uint32 A, B, C, D, X[16];

    GET_UINT32( X[0], data, 0 );
    GET_UINT32( X[1], data, 4 );
    GET_UINT32( X[2], data, 8 );
    GET_UINT32( X[3], data, 12 );
    GET_UINT32( X[4], data, 16 );
    GET_UINT32( X[5], data, 20 );
    GET_UINT32( X[6], data, 24 );
    GET_UINT32( X[7], data, 28 );
    GET_UINT32( X[8], data, 32 );
    GET_UINT32( X[9], data, 36 );   
    GET_UINT32( X[10], data, 40 );
    GET_UINT32( X[11], data, 44 );
    GET_UINT32( X[12], data, 48 );
    GET_UINT32( X[13], data, 52 );
    GET_UINT32( X[14], data, 56 );
    GET_UINT32( X[15], data, 60 );

#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))

#define P(a,b,c,d,k,s,t)\
    {                                                       \
        a += F(b,c,d) + X[k] + t; a = S(a,s) + b;           \
    }

    A = ctx->state[0];
    B = ctx->state[1];
    C = ctx->state[2];
    D = ctx->state[3];

#define F(x,y,z) (z ^ (x & (y ^ z)))

    P( A, B, C, D, 0, 7, 0xD76AA478 );
    P( D, A, B, C, 1, 12, 0xE8C7B756 );
    P( C, D, A, B, 2, 17, 0x242070DB );
    P( B, C, D, A, 3, 22, 0xC1BDCEEE );
    P( A, B, C, D, 4, 7, 0xF57C0FAF );
    P( D, A, B, C, 5, 12, 0x4787C62A );
    P( C, D, A, B, 6, 17, 0xA8304613 );
    P( B, C, D, A, 7, 22, 0xFD469501 );
    P( A, B, C, D, 8, 7, 0x698098D8 );
    P( D, A, B, C, 9, 12, 0x8B44F7AF );
    P( C, D, A, B, 10, 17, 0xFFFF5BB1 );
    P( B, C, D, A, 11, 22, 0x895CD7BE );
    P( A, B, C, D, 12, 7, 0x6B901122 );
    P( D, A, B, C, 13, 12, 0xFD987193 );
    P( C, D, A, B, 14, 17, 0xA679438E );
    P( B, C, D, A, 15, 22, 0x49B40821 );

#undef F

#define F(x,y,z) (y ^ (z & (x ^ y)))

    P( A, B, C, D, 1, 5, 0xF61E2562 );
    P( D, A, B, C, 6, 9, 0xC040B340 );
    P( C, D, A, B, 11, 14, 0x265E5A51 );
    P( B, C, D, A, 0, 20, 0xE9B6C7AA );
    P( A, B, C, D, 5, 5, 0xD62F105D );
    P( D, A, B, C, 10, 9, 0x02441453 );
    P( C, D, A, B, 15, 14, 0xD8A1E681 );
    P( B, C, D, A, 4, 20, 0xE7D3FBC8 );
    P( A, B, C, D, 9, 5, 0x21E1CDE6 );
    P( D, A, B, C, 14, 9, 0xC33707D6 );
    P( C, D, A, B, 3, 14, 0xF4D50D87 );
    P( B, C, D, A, 8, 20, 0x455A14ED );
    P( A, B, C, D, 13, 5, 0xA9E3E905 );
    P( D, A, B, C, 2, 9, 0xFCEFA3F8 );
    P( C, D, A, B, 7, 14, 0x676F02D9 ); 
    P( B, C, D, A, 12, 20, 0x8D2A4C8A );

#undef F

#define F(x,y,z) (x ^ y ^ z)

    P( A, B, C, D, 5, 4, 0xFFFA3942 );
    P( D, A, B, C, 8, 11, 0x8771F681 );
    P( C, D, A, B, 11, 16, 0x6D9D6122 );   
    P( B, C, D, A, 14, 23, 0xFDE5380C );
    P( A, B, C, D, 1, 4, 0xA4BEEA44 );
    P( D, A, B, C, 4, 11, 0x4BDECFA9 );
    P( C, D, A, B, 7, 16, 0xF6BB4B60 );
    P( B, C, D, A, 10, 23, 0xBEBFBC70 );
    P( A, B, C, D, 13, 4, 0x289B7EC6 )
    P( D, A, B, C, 0, 11, 0xEAA127FA );
    P( C, D, A, B, 3, 16, 0xD4EF3085 );
    P( B, C, D, A, 6, 23, 0x04881D05 );
    P( A, B, C, D, 9, 4, 0xD9D4D039 );
    P( D, A, B, C, 12, 11, 0xE6DB99E5 );
    P( C, D, A, B, 15, 16, 0x1FA27CF8 );
    P( B, C, D, A, 2, 23, 0xC4AC5665 );

#undef F   

#define F(x,y,z) (y ^ (x | ~z))

    P( A, B, C, D, 0, 6, 0xF4292244 );
    P( D, A, B, C, 7, 10, 0x432AFF97 );
    P( C, D, A, B, 14, 15, 0xAB9423A7 );
    P( B, C, D, A, 5, 21, 0xFC93A039 );
    P( A, B, C, D, 12, 6, 0x655B59C3 );
    P( D, A, B, C, 3, 10, 0x8F0CCC92 );
    P( C, D, A, B, 10, 15, 0xFFEFF47D );
    P( B, C, D, A, 1, 21, 0x85845DD1 );
    P( A, B, C, D, 8, 6, 0x6FA87E4F );
    P( D, A, B, C, 15, 10, 0xFE2CE6E0 );
    P( C, D, A, B, 6, 15, 0xA3014314 );   
    P( B, C, D, A, 13, 21, 0x4E0811A1 );
    P( A, B, C, D, 4, 6, 0xF7537E82 );
    P( D, A, B, C, 11, 10, 0xBD3AF235 );
    P( C, D, A, B, 2, 15, 0x2AD7D2BB );
    P( B, C, D, A, 9, 21, 0xEB86D391 );

#undef F

    ctx->state[0] += A;
    ctx->state[1] += B;
    ctx->state[2] += C;
    ctx->state[3] += D;
}   

void CMD5::md5_update(struct md5_context *ctx, const uint8 *input, uint32 length)
{   
    uint32 left, fill;

    if( ! length ) return;   

    left = ( ctx->total[0] >> 3 ) & 0x3F;   
    fill = 64 - left;   

    ctx->total[0] += length << 3;   
    ctx->total[1] += length >> 29;   

    ctx->total[0] &= 0xFFFFFFFF;   
    ctx->total[1] += ctx->total[0] < length << 3;   

    if( left && length >= fill )   
    {   
        memcpy( (void *) (ctx->buffer + left), (void *) input, fill );   
        md5_process( ctx, ctx->buffer );   
        length -= fill;   
        input += fill;   
        left = 0;   
    }   

    while( length >= 64 )   
    {   
        md5_process( ctx, input );   
        length -= 64;   
        input += 64;   
    }   

    if( length )   
    {   
        memcpy( (void *) (ctx->buffer + left), (void *) input, length );   
    }   
}   

static uint8 md5_padding[64] =   
{   
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0   
};   

void CMD5::md5_finish( struct md5_context *ctx, uint8 digest[16] )   
{   
    uint32 last, padn;   
    uint8 msglen[8];   

    PUT_UINT32( ctx->total[0], msglen, 0 );   
    PUT_UINT32( ctx->total[1], msglen, 4 );   

    last = ( ctx->total[0] >> 3 ) & 0x3F;   
    padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );   

    md5_update( ctx, md5_padding, padn );   
    md5_update( ctx, msglen, 8 );   

    PUT_UINT32( ctx->state[0], digest, 0 );   
    PUT_UINT32( ctx->state[1], digest, 4 );   
    PUT_UINT32( ctx->state[2], digest, 8 );   
    PUT_UINT32( ctx->state[3], digest, 12 );   
}   

void CMD5::GenerateMD5(const unsigned char* buffer, uint32 bufferlen)
{   
    struct md5_context context;   
    md5_starts (&context);   
    md5_update (&context, buffer, bufferlen);   
    md5_finish (&context,(unsigned char*)m_data);   
}   

CMD5::CMD5()   
{   
    for(int i=0;i<4;i++)   
        m_data[i]=0;   
}   

CMD5::CMD5(unsigned long* md5src)   
{   
    memcpy(m_data,md5src,16);   
}   
int _httoi(const char *value)   
{   
    struct CHexMap   
    {   
        char chr;   
        int value;   
    };   
    const int HexMapL = 16;   
    CHexMap HexMap[HexMapL] =   
    {   
        {'0', 0}, {'1', 1},   
        {'2', 2}, {'3', 3},   
        {'4', 4}, {'5', 5},   
        {'6', 6}, {'7', 7},   
        {'8', 8}, {'9', 9},   
        {'a', 10}, {'b', 11},   
        {'c', 12}, {'d', 13},   
        {'e', 14}, {'f', 15}   
    };   
    //pthread_mutex_lock(&mutexMemory);   
    char *mstr = strdup(value);   
    //pthread_mutex_unlock(&mutexMemory);   
    char *s = mstr;   
    int result = 0;   
    if (*s == '0' && *(s + 1) == 'X') s += 2;   
    bool firsttime = true;   
    while (*s != '\0')   
    {   
        bool found = false;   
        for (int i = 0; i < HexMapL; i++)   
        {   
            if (*s == HexMap[i].chr)   
            {   
                if (!firsttime) result <<= 4;   
                result |= HexMap[i].value;   
                found = true;   
                break;   
            }   
        }   
        if (!found) break;   
        s++;   
        firsttime = false;   
    }   
    //pthread_mutex_lock(&mutexMemory);   
    free(mstr);   
    //pthread_mutex_unlock(&mutexMemory);   
    return result;   
}   


CMD5::CMD5(const char* md5src)   
{   
    if (strcmp(md5src,"")==0)   
    {   
        for(int i=0;i<4;i++)   
            m_data[i]=0;   
        return;   
    }   
    for(int j = 0; j < 16; j++ )   
    {   
        char buf[10];   
        strncpy(buf,md5src,2);   
        md5src+=2;   
        ((unsigned char*)m_data)[j] = _httoi(buf);   
    }   
}   

CMD5 CMD5::operator +(CMD5 adder)   
{   
    unsigned long m_newdata[4];   
    for(int i=0;i<4;i++)   
        m_newdata[i]=m_data[i]^(adder.m_data[i]);   
    return CMD5(m_newdata);   
}   

bool CMD5::operator ==(CMD5 cmper)   
{   
    return (memcmp(cmper.m_data ,m_data,16)==0);   
}   

//void CMD5::operator =(CMD5 equer)   
//{   
// memcpy(m_data,equer.m_data ,16);   
//}   

string CMD5::ToString()   
{   
    char output[33];   
    for(int j = 0; j < 16; j++ )   
    {   
        sprintf( output + j * 2, "%02X", ((unsigned char*)m_data)[j]);   
    }
	output[32] = '\0';

    return string(output);   
} 
}

